I graduated from Chang 'an University in July 20xx with a bachelor's degree and a bachelor's degree in engineering. After graduation, I worked in Zhengzhou Highway Survey and Design Institute, engaged in highway bridge and culvert survey and design, and obtained the qualification of assistant engineer in 20xx. 20xx was employed by China Communications Electric Highway Survey and Design Engineering Co., Ltd. in May and has been working ever since.
Since I joined the work in July, 20xx, I have successively participated in and completed the following major projects: the reconstruction project from Yufa Street to Gongyi Baihe section of Henan S237 Xugong Line, participated in the survey and design of bridges and culverts in this project, and independently completed the interior design of several bridges and culverts; G207 Shaolin Temple-Dengfeng Section Reconstruction Project, as the main participant of the project, participated in the on-site investigation of bridges and culverts, independently completed the hydrological calculation of all bridges and culverts, and independently completed the interior design of several bridges and culverts; Wansan Highway Reconstruction Project, as the main participant of the project, participated in the field survey of bridges and culverts and independently completed the interior design of several bridges and culverts; Worked as the bridge and culvert team leader in the newly-built project of Hegang-Xinzheng section of Zhongmu in Henan S223 line, participated in the field survey of bridges and culverts, independently completed all hydrological calculations of bridges and culverts, and independently completed the interior design of Jia Luhe Bridge 1 and Jia Luhe Second Bridge; G 107 Xinzheng border reconstruction project, served as the bridge and culvert team leader, participated in the field investigation of bridges and culverts, independently completed all hydrological calculations of bridges and culverts, and independently completed the interior design of Shuanghui River Bridge; Zhengzhou G3 10 line reconstruction project from Xigang to Shangjie West, as the main participant of the project, independently completed the structural calculation and construction drawing design of fish-bellied box girder of Xu Shui Separation Interchange, which won unanimous praise; Served as the bridge and culvert team leader in the Xinzhoukou boundary project of S2 19 Yongding Line in Henan Province, participated in the field survey of bridges and culverts, independently completed the hydrological calculation of the whole bridge and completed the interior design of Shahe Bridge; In the new construction project of Kaifeng-Xinzheng International Airport in Henan Province, he served as the captain of the bridge and culvert team, participated in the field investigation of bridges and culverts, independently completed the hydrological calculation of the whole bridge and the structural calculation and drawing design of several overpass bridges; The newly-built Shatanjiang-Qisha first-class highway project in Fangchenggang City, Guangxi Province, as the main participant of the project, independently completed the interior design of several bridges and culverts; Bridge maintenance and reinforcement project of Qingyuan-Lianzhou first-class highway upgrade (expressway) project, independently completed the structural checking and reinforcement calculation of 57 bridges in this project, and put forward a number of reinforcement schemes, which won unanimous praise; As the main participant of the new project from Lingfeng to Babu in expressway, Guanghe, Guangxi, the interior design of two interchange bridges was independently completed; In the reconstruction and expansion project of Shibing-Qingxi Wulipai section of Guizhou Provincial Highway 306, he served as the leader of the bridge and culvert team, participated in the field investigation of bridges and culverts, independently completed the hydrological calculation of the whole bridge culvert, and independently completed the interior design of several bridges and culverts; In the reconstruction project of Yadong-Naiduila Highway in Shigatse, Tibet, he served as the head of the bridge and culvert team, participated in the field survey of bridges and culverts, independently completed the hydrological calculation of the whole bridge culvert, and independently completed the indoor design of several bridges and culverts; Tibet Taizhao-Azar Highway Project, as the head of the bridge and culvert team, participated in the field survey of bridges and culverts, and independently completed the hydrological calculation of the whole bridge culvert.
Immediately complete the interior design of several bridges and culverts; Expressway Tongguan-Huayin road improvement project in Lianhuo, as the main participant of the project, participated in the on-site road survey and independently completed the road improvement scheme design and construction drawing design of some sections; Guangdong Shenshan West expressway Overhaul Project, as the main participant of the project, participated in the on-site road survey and bridge and culvert survey, and independently completed the maintenance and reinforcement design of the whole bridge deck and the pavement improvement design of some sections.
In the above work, I have been careful and experienced all aspects of low-grade highway reconstruction and high-grade highway design. Bridges and culverts involve plain areas, hilly areas, hilly areas, cities and other typical areas. My professional work ranges from field investigation and hydrological calculation to structural calculation and drawing design. After years of tempering, I have a more comprehensive understanding of the survey and design of highway bridges and culverts, and from the engineering practice. The following is a summary of the main technical work completed and the professional skills mastered since joining the work:
(1) field investigation
After work, I have been responsible for the on-site investigation of bridges and culverts in several projects. Through the implementation of a large number of highway reconstruction and expansion projects, such as the reconstruction project from Yudengjie to Gongyi Baihe section of Henan S237 Xugong line, the reconstruction project of Xinzheng section of G 107 line, the reconstruction project of Xigang to Shangjie West section of Zhengzhou G3 10 line, the reconstruction and expansion project of Shibing-Qingxi Wulipai section of Guizhou 306 provincial highway, and the reconstruction project of Yadong-Naidula highway in Shigatse area of Tibet, etc. I have gradually mastered the external bridges and culverts in the reconstruction and expansion of existing highways. For the existing bridges along the line, we must first understand the basic information of the bridge, such as the starting and ending pile numbers, the number of holes, the skew angle, the upper and lower structural forms, the clear width of the bridge deck, the load level, and the flood discharge capacity. , and then carefully check the diseases of bridge deck pavement, expansion joints, guardrails, bearings, main beams, piers and protective structures, and carry out inspection and load test when necessary to evaluate the overall technical condition of the bridge before further deciding to dismantle it. If we decide to rebuild and use the bridge, we should reinforce all kinds of diseases existing in the bridge. If the bridge width is not enough, it should be widened and an economical and reasonable widening scheme should be adopted. For the existing culverts along the line, it is necessary to carefully check the flood discharge capacity of the culvert, the diseases of the tunnel body and the cover plate, and make a judgment on whether to extend the use or dismantle the new one. When widening or lengthening bridges and culverts, it should be done on one side as far as possible.
Through a number of new projects, such as the new construction of Zhongmu Hegang-Xinzheng section of S223 line in Henan Province, the new construction of Zhoukou boundary of S2 19 Yongding line in Henan Province, the new construction of expressway from Kaifeng to Xinzheng International Airport in Henan Province, the new construction of Shatanjiang-Qisha first-class highway in Fangchenggang City, Guangxi, and the new construction of Lingfeng-Babu section in expressway, Guangxi, We have experienced field work from low grade to various highway grades and terrain areas. We can reasonably choose the bridge site according to the terrain, landform, landform characteristics and engineering geological conditions, and gradually master the technical points of bridge site selection in general engineering geological areas and special geological areas such as debris flow areas, karst areas, landslide areas, swamp areas and loess areas.
(2) Hydrological analysis
Participated in the reconstruction project from G207 Shaolin Temple to Dengfeng, the new project from Zhongmu Hegang to Xinzheng 8000 on S223 line in Henan, the new project from Zhoukou to Xinzheng International Airport on S2 19 Yongding line in Henan, the new project from Kaifeng to Xinzheng International Airport in Henan, the reconstruction project from Yadong to Naidui La in Shigatse, Tibet, and the reconstruction and expansion project of Shibing to Qingxi Wulipai section on 306 provincial highway in Guizhou. I organized and participated in the field investigation of bridges and culverts and collected data. In the face of a new project, we must first understand the climate, meteorology, geology, water distribution and vegetation in the project area, carefully investigate the historical floods along the river, collect relevant information of rivers and reservoirs in the project area from local water conservancy departments and hydrological stations, draw a sketch of the basin area, measure the river gradient, select the morphological section, and investigate the geological conditions of the river bed at the bridge site, so as to make early preparations for hydrological calculation.
Flowmeter is the key to hydrological calculation. When the measured data of hydrological stations are available, the design flood frequency and flow of the bridge site should be calculated by using the measured data over the years as far as possible, and Pearson ⅲ curve can be used for statistical analysis. When there is no measured discharge data, the national empirical formula of hydrological regionalization, the formula of rainstorm reasoning and the empirical formula of rainstorm can be used to calculate the discharge, and the morphological section method can also be used to calculate the discharge according to the historical flood traces investigated. If the local flow calculation formula and calculation chart conform to the local characteristics, the local empirical formula can be used to calculate the flow. When calculating the flow, various methods should be used for comparison to get more reasonable flow results.
(3) Structural design calculation
Since I joined the work, I have gained a deeper understanding of the basic ideas, methods and steps of bridge and culvert design through the engineering practice of several projects, especially as the person in charge of bridges and culverts. From bridge structure calculation to CAD drawing, I can complete it with high quality and high speed. I also taught myself structural calculation and drawing software such as Dr. Bridge, MIDAS and Bridge Link. And compiled several practical programs, so that I can skillfully calculate and analyze the superstructure, substructure and foundation of the bridge. The calculation of transverse distribution coefficient is the key for assembled simply supported beam bridges, simply supported beam bridges and continuous beam bridges. According to the actual stress characteristics of bridge structure, I can skillfully use various practical calculation methods such as lever method, hinged plate method, rigid plate beam method and rigid beam method to calculate the lateral distribution coefficient. For continuous beam bridges, I can modify the bending stiffness of the section and convert it into simply supported beams with the same span, and calculate the lateral distribution of each main beam. For the bridge span structure with middle partition, the grillage method can also be used for calculation, and the calculation results of grillage method can be mutually verified to judge the accuracy and rationality of the calculation results. Through the design and calculation of fish-bellied box girder of Xu Shui separated overpass and the design and calculation of Lingfeng-Babu interchange in expressway of Guanghe, Guangxi, the technical points of spatial calculation and analysis of complex structures are basically mastered.
The substructure usually adopts flexible pier systems such as column pier, thin-walled pier and hollow thin-walled pier. The pier body and the rubber bearing on it are connected in series, and the piers are connected in parallel. The longitudinal horizontal forces such as automobile braking force, horizontal wind force and seismic force of the superstructure should be distributed according to the horizontal thrust stiffness of each pier in a joint. The horizontal force of temperature and the influence of concrete shrinkage are self-balancing forces. Firstly, the position of temperature zero is calculated according to the horizontal thrust stiffness of each pier, and then the horizontal force of each pier is calculated according to the actual temperature difference, the extreme value of shrinkage strain and the distance between each pier and the temperature zero. The total horizontal force of each pier should not exceed the corresponding bearing friction. After calculating the horizontal force and vertical force of pier top, the reinforcement of pier body can be calculated as eccentric compression member.
(D) the level of theoretical knowledge
In the past few years, I have always attached importance to improving my theoretical knowledge and studying the design principles and methods of bridge structures. First of all, I understand and master various bridge design specifications. Through reading the specifications repeatedly, I gradually master the basic provisions of bridge design, load and load combination in the specifications, and can accurately check the ultimate state reinforcement and bearing capacity, stress, crack and deflection in normal use, and construction stage. In addition, I also found special introduction books on various bridge types such as beam bridge, arch bridge, continuous rigid frame, cable-stayed bridge and concrete-filled steel tubular arch bridge to learn. Strive to master the design points and methods of various bridge types, integrate theory with practice in work, and humbly ask for advice from predecessors, so that their professional and technical level has been greatly improved.
In addition, I applied for the first-class registered structural engineer myself, passed the examination of basic courses in 2004, and then immediately set about reviewing professional courses. The examination of specialized courses involves more than 30 design codes and regulations, from building structure to bridge structure, from foundation to superstructure, from masonry structure and wood structure to concrete structure and steel structure, covering almost all aspects of structural design. I am very pleased to see that every page of the review tutorial is covered with lines of handwritten notes. On September 23, 2007, I took the professional course exam, and the results have not yet been announced.
Through unremitting efforts in recent years, by participating in the survey and design of several projects, and serving as the leader of the bridge and culvert specialty in the project, I have been able to independently complete various contents of bridges and culverts, such as site survey, hydrological calculation, structural calculation and drawing design. , can master all kinds of structural calculation and analysis software, design all kinds of bridge structures, and be competent for all kinds of work roles of bridge and culvert specialty.
But I will make persistent efforts, work harder, learn with an open mind, further improve my professional knowledge, work diligently in my post, carefully survey and design, draw a new blueprint for the healthy development of the highway cause, and make greater contributions!